CN101995394A - Mist zone visibility detection method and equipment - Google Patents
Mist zone visibility detection method and equipment Download PDFInfo
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- CN101995394A CN101995394A CN2009100235701A CN200910023570A CN101995394A CN 101995394 A CN101995394 A CN 101995394A CN 2009100235701 A CN2009100235701 A CN 2009100235701A CN 200910023570 A CN200910023570 A CN 200910023570A CN 101995394 A CN101995394 A CN 101995394A
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Abstract
The invention discloses a mist zone visibility detection method and mist zone visibility detection equipment. By measuring scattering strength of mist on light, an extinction coefficient is acquired and a visibility value is finally acquired. Laser is adopted as a detection light source, and a photoelectric detector is used for receiving the light. Mist with different visibility values brings different scattering receiving results; when the visibility is high, light scattering is low and an output value on the photoelectric detector is low; and when the mist visibility is low, a receiving value of the photoelectric detector is increased. By analyzing and calculating scattered light receiving data, the mist visibility value is acquired, and through multipoint arranged photoelectric receivers and the correction of environmental temperature and humidity, the measurement accuracy can be effectively improved. A wireless communication module is arranged inside an instrument, and remote signal transmission can be realized. The instrument is convenient to use, overcomes the defect that the conventional related products have high cost, and is convenient to monitor environment in foggy weather.
Description
Technical field
The present invention relates to a kind of environmental information monitoring method and equipment thereof, be specifically related to a kind of method and equipment thereof that fog-zone visibility detects that is used for.
Background technology
Mist is state because the moisture in the atmosphere reaches capacity, and condenses into little crystalline substance and drips, and floats near a kind of weather phenomenon in ground.The influence in greasy weather can be represented with visibility and sighting distance relation.Visibility is meant to be the visibility distance of object, when being meant the observed object thing, can tell the ultimate range of object profile from background, and it is the contrast function of object and background.When being full of minute particles in the air, can carry out scattering to light, thereby have a strong impact on the sighting distance sharpness, cause visibility to reduce.
The reduction of visibility is very big to human traffic activity influence.Because mist will make environment visibility reduce on a large scale, this produces great potential safety hazard to all producing many adverse influences as communications and transportation such as ferry, civil aviaton, highway and electric power supply, civic daily life.
Greasy weather is particularly serious to the traffic safety influence, and the driver who is in the fog-zone is difficult to see clearly front truck, has the vision blind area; Do not see peripheral road conditions, do not have vehicle or building to make object of reference, cause the imperceptible speed of a motor vehicle of driver; Driver's eyes can't be seen signal lamp and notice board clearly to the color identifying ability drop; Can't control distance, make the driver in advance or spend evening and turn etc. at the crossing.Above-mentioned situation has directly caused the generation of traffic hazard, in the traffic hazard of highway, because the traffic hazard that the influence of inclement weathers such as thick fog causes accounts for more than 1/4 of sum, has caused heavy losses for the country and people's lives and properties.
At present, China's highway development rapidly, but the fog-zone detection system research of China is just at the early-stage, though carried out the mist detection, forecast, fog-zone traffic safety and supervisory system, the research of aspects such as greasy weather control of traffic and road, and set up reasonable weather watch-dog station, but do not form low cost as yet and in real time expressway fog zone is carried out detection system and theory and method, therefore, China's highway and high-grade highway greasy weather, current management still adopted artificial mist feelings to detect, the administrative skill and the measure of total man worker or half artificialization such as manually dredge, standardization, objectivity is relatively poor relatively.
Though directly sealing waits the labor management method to prevent the generation of traffic hazard, is cost with the traffic capacity of sacrificing highway, has caused enormous economic loss for simultaneously the highway owner, is unfavorable for making up harmonious traffic environment.
The method of measuring atmospheric visibility is divided into artificial visually examine and monitor measurement, and visibility monitor metering system mainly contains transmission-type, scatter-type and lidar measurement instrument.But there is following problem in such mode:
The atmospheric transmission instrument is directly to measure the gas column transmissivity by the big gas column that light beam sees through between two point of fixity, calculate the value of visibility with this, this method requires light beam by sufficiently long big gas column, measuring reliability is subjected to the influence of light source and other hardware system job stabilitys, the general observation that only is applicable to low middling visibility, and at low visibility weather such as rain, mists, can cause than mistake because of complex conditions such as water vapor absorption.
Lidar measurement instrument system complexity costs an arm and a leg.
Scatter-type is the mode of the present measurement mist visibility of using always.Mostly import of visiometer product commonly used is the visiometer of FD12 as Finland VAISALAD company model, and it is made up of optical transmitting set, optical receiver and controller, and the visibility investigative range is a 10-50000 rice.In recent years domestic also have Related product to sell, but profile and implementation method and external product are unanimous on the whole.This series products has the following disadvantages: instrument is divided into emission and receives two parts, big on the volume, installation inconvenience; Instrument costs an arm and a leg, and has limited and has promoted the use of; The maintenance cost height.
With regard to China's present circumstances, above-mentioned visibility monitor need rely on import, and this instrument cost costliness, maintenance cost height, complicated operation have limited range of application, only adorn 1-2 cover instrument in the general big zone, bring many problems for the actual use of China's highway.For example have only a check point in one section highway scope, generally be placed in charging aperture, but because the formation of mist and the no regularity of variation, make the Fog detector of mounting points as illusory, may occur that sensing point has mist and several kilometers do not have mist outward; Sensing point perhaps occurring does not have mist, and several kilometers situations of having a dense fog outward.This will bring the current rate of vehicle and the contradiction of security, also be to perplex freeway management and safe a great problem for many years.
Summary of the invention
The invention provides a kind of fog-zone visibility detection method and equipment thereof, mainly solved existing fog-zone visibility detection method and the Equipment Inspection precision is low, cost is high, the problem of complicated operation.
Technical solution of the present invention is as follows:
This fog-zone visibility detection method may further comprise the steps:
(1) emission detection light
The detection light that probe source is launched is laser, can disperse or expands bundle and handle the detection light of launching; Probe source can be powered by solar panel; Probe source can be selected LED or semiconductor laser; The repetition frequency of laser instrument is 0.5Hz-10Hz, and operation wavelength is 530nm, 630nm, 650nm, 808nm or 850nm; The output power of described laser instrument is at least 10mW.
(2) survey mist visibility
Survey that light enters the fog-zone after the fine droplet scattering that suspends, light path changes, and forms scattered light;
(3) receiving scattered light
Scattered light is distributed on surveys the Electro-Optical Sensor Set reception all around of light forward direction, obtains the light signal value; Electro-Optical Sensor Set is provided with 3 at least, and Electro-Optical Sensor Set be arranged at not collinear on;
(4) draw mist visibility
The light signal value transfers to disposal system through transmission system, obtains extinction coefficient after the processing, calculates mist visibility according to the close moral principle of Cauchy.
In the above step (3) receiving scattered light, be provided with and be used for measures ambient temperature, the isoparametric signal testing of humidity unit, test result transfers to disposal system by the transmission system that step (4) draws in the mist visibility.
The above step (4) draws in the mist visibility, and transmission system is a wireless telecommunication system; Described wireless telecommunication system is GPRS or GPS.
This fog-zone visibility checkout equipment comprises probe source and housing, and probe source is arranged at housing one end, is provided with 3 photodetectors on the housing at least, and housing is provided with at least 3 fog-entering holes.
The above photodetector is connected with the signal transmitting apparatus that the light signal value is transferred to disposal system.
The above photodetector is photoelectric cell or photodiode; Described fog-entering hole is the circle or the hole polygonal hole of helical arrangement.
The invention has the advantages that:
1, the present invention can make the measurement forecast of dense fog in some field of traffic break away from the situation that relies on naked eyes to judge, department provides visibility information accurately for the point duty guarantee.
2, cost of the present invention is low, has enlarged usable range, is suitable for product promotion.
3, the present invention uses LED or semiconductor laser as light source, not only saves cost but also can reduce the interference of environment veiling glare.
4, the present invention uses the laser work mode of dispersing or expanding bundle, can improve scattering and receive resolution.
5, the present invention uses forward direction to combine detecting strategy with back scattering, can become one receiving with emission.
6, system power dissipation of the present invention is low, uses solar poweredly, having convenient, the energy-saving advantages of power supply, need not set up electric power system specially, can be fit to remote districts and use.
7, the present invention uses wireless communication system, has both had signal transfer functions, by possessing location and anti-theft feature;
8, system of the present invention can work in 24 hours, flexible and convenient to use.
9, system automation degree height of the present invention, and gather multi-function in integral whole, use value improved.
Description of drawings
Fig. 1 is a photo-electric fog-zone visibility detector principle assumption diagram;
Fig. 2 is a photo-electric fog-zone visibility detector structural representation.
Embodiment
The present invention adopts based on fog the principle that laser has scattering effect to be obtained in conjunction with the optical signature of mist.Below in conjunction with Fig. 1, Fig. 2 the present invention is described in detail.
The visibility of mist can obtain by measuring the conversion of mist air extinction coefficient.According to the close moral of Cauchy (Koschmieder) principle,, establish visibility sighting distance V to being the black matrix object of background with horizontal sky
mAnd satisfy following empirical relationship between the burn-off light factor sigma
λ is an optical wavelength in the formula, and q is the coefficient relevant with the visibility sighting distance.Therefore can calibrate visibility by measuring burn-off spectrum number.
Under certain condition, the absorption effect of light can be ignored, thereby on engineering was used, extinction coefficient was considered to equal scattering coefficient.Try to achieve its scattering coefficient by detecting scattering strength, and then can calculate out the atmospheric visibility value according to relevant mathematical model.Can obtain the rate of change of required mist visibility by the calculating of microcomputer program.
As shown in Figure 1, method of the present invention is as follows:
(1) emission detection light
The detection light that probe source is launched is laser, can disperse or expands bundle and handle the detection light of launching; Probe source can be powered by solar panel.
(2) survey mist visibility
Survey that light enters the fog-zone after the fine droplet scattering that suspends, light path changes, and forms scattered light;
(3) receiving scattered light
Scattered light is distributed on surveys the Electro-Optical Sensor Set reception all around of light forward direction, obtains the light signal value; Electro-Optical Sensor Set is provided with 3 at least, and Electro-Optical Sensor Set be arranged at not collinear on;
(4) draw mist visibility
The light signal value transfers to disposal system through transmission system, obtains extinction coefficient after the processing, calculates mist visibility according to the close moral principle of Cauchy.
Solar panel is all unit power supplies of instrument by receiving sun power, output power 40W.Adopt solar panel to charge, environmental protection, removable performance is good.
Probe source 1 is arranged at housing 2 one ends, and probe source 1 sends laser as talking photometry, and for energy-conservation needs, laser adopts discontinuous output, and laser output time and repetition frequency can be controlled by control module.Laser can be launched once at set intervals, and can set interval time by control module 4.Probe source 1 work repetition frequency is from 0.5Hz-10Hz, and operation wavelength is optional based on the actual application requirements: 530nm, 630nm, 650nm, 808nm, 850nm etc.; The output power of probe source 1 is more than the 20mW.
Use LED or semiconductor laser as probe source 1, after surveying the light outgoing, can disperse or expand bundle and handle, can improve scattering and receive resolution.Road speed and sighting distance concern that difference is little when having daytime mist and evening that mist is arranged, thus result of detection not can owing to daytime and evening visibility difference cause big measuring error.
Use laser as surveying light, its stability is decided by the mass property of laser instrument, as long as can cover from other interference of light sources, photo-electric fog-zone visibility observation instrument can use with night by day.
Also be provided with the photodetector 3 of receiving scattered light in the housing 2, photodetector 3 is at least 3, and is distributed in all angles diverse location in the housing 2, and the number of photodetector 3 is many more, the precision of measuring is high more, and photodetector 3 can be selected photoelectric cell or photodiode for use.By photodetector perception scattered light variable quantities such as photoelectric cell, photodiodes, survey the visibility of mist.Can survey the method raising measuring accuracy of overall treatment measurement result by multiple spot.
Should be provided with fog-entering hole 21 on the housing 2, fog-entering hole 21 should distribute as far as possible uniformly, makes that the mist of housing 2 inside is identical with the mist visibility of measured fog-zone, and fog-entering hole 21 is good with the circle or the hole polygonal hole of helical arrangement.
Also can be provided with parameters such as sensing reference signal test cell 5 measures ambient temperature, humidity in the housing 21, be used for cooperating demarcation mist visibility.4 pairs of whole workflows of control module are controlled automatically.
By signal transmission system 6 signal is carried out wireless transmit to disposal system 7.Signal transmission system 6 can adopt the technology of existing ripe and widespread use, as GPRS, GPS etc., can to metrical information transmit and, can play the equipment positioning function simultaneously, play antitheft effect.
Solar panel is all unit power supplies of instrument by receiving sun power, output power 40W.Adopt solar panel to charge, environmental protection, removable performance is good.
Survey the small water droplet that light touches in the mist scattering can take place, simultaneously, survey when light passes small water droplet and also can produce decay, so scattering of light intensity is relevant with mist visibility size.When mist visibility was very high, light is transmission almost completely, and a little less than the laser light scattering, photodetector 3 output valves are little; When the mist low visibility, the scattering effect of laser strengthens, and it is big that photodetector 3 output valves become.
Light signal value according to scattering receives can calculate the visibility that calibrates mist, finally by demarcating the quantized value that can draw fog-zone visibility checkout equipment.Measurement result can also be revised by measurement results such as 5 pairs of temperature of sensing reference signal test cell, humidity.Sensing reference signal test cell 5 one ends are connected with control module 4, and the other end is connected with photodetector 3.
This fog-zone visibility checkout equipment can detect in real time to the visibility of system-wide section.Can be at highway every monitoring point of 5 kilometers installations, because the continuity that detects can be guaranteed the real-time detection of system-wide section mist, for road administration, traffic administration, current rate and security provide decision-making foundation accurately.Can be used to control the output of mist illuminating lamp, mist warning sign board simultaneously with the visibility result of detection.
This fog-zone visibility checkout equipment, can monitor, send early warning signal in real time to the highway of fog-zone and the mist feelings in one-level high-grade highway section highway section, make the administrative authority of highway in time understand the mist condition information of road ahead, ensure that by inducing travelling in fog day safety provides the basis with control device such as restricted speed for follow-up.
Claims (10)
1. a fog-zone visibility detection method is characterized in that, may further comprise the steps:
(1) emission detection light
Probe source is launched detection light, and described detection is laser only;
(2) survey mist visibility
Survey that light enters the fog-zone after the fine droplet scattering that suspends, light path changes, and forms scattered light;
(3) receiving scattered light
Scattered light is distributed on surveys the Electro-Optical Sensor Set reception all around of light forward direction, obtains the light signal value;
(4) draw mist visibility
The light signal value transfers to disposal system through transmission system, obtains extinction coefficient after the processing, calculates mist visibility according to the close moral principle of Cauchy.
2. fog-zone according to claim 1 visibility detection method, it is characterized in that: in described step (3) receiving scattered light, be provided with and be used for measures ambient temperature, the isoparametric signal testing of humidity unit, test result transfers to disposal system by the transmission system that step (4) draws in the mist visibility.
3. fog-zone according to claim 1 and 2 visibility detection method is characterized in that: in described step (1) the emission detection light, probe source is LED or semiconductor laser; The repetition frequency of described laser instrument is 0.5Hz-10Hz, and operation wavelength is 530nm, 630nm, 650nm, 808nm or 850nm; The output power of described laser instrument is at least 10mW.
4. fog-zone according to claim 3 visibility detection method is characterized in that: described step (3) receives to be visited in the scattered light, and Electro-Optical Sensor Set is provided with 3 at least.
5. fog-zone according to claim 4 visibility detection method is characterized in that: described step (4) draws in the mist visibility, and transmission system is a wireless telecommunication system; Described wireless telecommunication system is GPRS or GPS.
6. fog-zone according to claim 5 visibility detection method is characterized in that: in described step (1) the emission detection light, the detection light of launching is dispersed or expanded bundle and handle.
7. fog-zone according to claim 6 visibility detection method is characterized in that: in described step (1) the emission detection light, probe source is powered by solar panel.
8. a fog-zone visibility checkout equipment comprises probe source and housing, and described probe source is arranged at housing one end, it is characterized in that: be provided with 3 photodetectors on the described housing at least, described housing is provided with at least 3 fog-entering holes.
9. fog-zone according to claim 8 visibility checkout equipment, it is characterized in that: described photodetector is connected with the signal transmitting apparatus that the light signal value is transferred to disposal system.
10. fog-zone according to claim 9 visibility checkout equipment is characterized in that: described photodetector is photoelectric cell or photodiode; Described fog-entering hole is the circle or the hole polygonal hole of helical arrangement.
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| CN2009100235701A CN101995394A (en) | 2009-08-11 | 2009-08-11 | Mist zone visibility detection method and equipment |
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| CN2009100235701A CN101995394A (en) | 2009-08-11 | 2009-08-11 | Mist zone visibility detection method and equipment |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103413442A (en) * | 2013-07-30 | 2013-11-27 | 刘伟 | Highway agglomerate fog early warning system based on intervisibility distance monitoring and early warning method thereof |
| CN105021573A (en) * | 2014-05-02 | 2015-11-04 | 罗伯特·博世有限公司 | Method and device for tracking-based visibility range estimation |
| CN107421917A (en) * | 2017-05-17 | 2017-12-01 | 南京信息工程大学 | A kind of multifunction high-precision atmosphere visibility meter and visibility measurement method |
| CN108898846A (en) * | 2018-07-23 | 2018-11-27 | 王丽燕 | A kind of road traffic group's mist early warning system and its method for early warning |
| CN114280056A (en) * | 2021-12-20 | 2022-04-05 | 北京普测时空科技有限公司 | Visibility measurement system |
| CN114757238A (en) * | 2022-06-15 | 2022-07-15 | 武汉地铁集团有限公司 | Method and system for monitoring deformation of subway protection area, electronic equipment and storage medium |
| CN117409576A (en) * | 2023-09-28 | 2024-01-16 | 中国公路工程咨询集团有限公司 | Neural network-based integrated monitoring system for disaster sky along road |
-
2009
- 2009-08-11 CN CN2009100235701A patent/CN101995394A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103413442A (en) * | 2013-07-30 | 2013-11-27 | 刘伟 | Highway agglomerate fog early warning system based on intervisibility distance monitoring and early warning method thereof |
| CN103413442B (en) * | 2013-07-30 | 2015-09-16 | 重庆交通大学 | Based on expressway fog early warning system and the method for early warning of the monitoring of intervisibility distance |
| CN105021573A (en) * | 2014-05-02 | 2015-11-04 | 罗伯特·博世有限公司 | Method and device for tracking-based visibility range estimation |
| CN107421917A (en) * | 2017-05-17 | 2017-12-01 | 南京信息工程大学 | A kind of multifunction high-precision atmosphere visibility meter and visibility measurement method |
| CN107421917B (en) * | 2017-05-17 | 2024-04-19 | 南京信息工程大学 | Multifunctional high-precision atmospheric visibility meter and visibility measuring method |
| CN108898846A (en) * | 2018-07-23 | 2018-11-27 | 王丽燕 | A kind of road traffic group's mist early warning system and its method for early warning |
| CN114280056A (en) * | 2021-12-20 | 2022-04-05 | 北京普测时空科技有限公司 | Visibility measurement system |
| CN114757238A (en) * | 2022-06-15 | 2022-07-15 | 武汉地铁集团有限公司 | Method and system for monitoring deformation of subway protection area, electronic equipment and storage medium |
| CN114757238B (en) * | 2022-06-15 | 2022-09-20 | 武汉地铁集团有限公司 | Method and system for monitoring deformation of subway protection area, electronic equipment and storage medium |
| CN117409576A (en) * | 2023-09-28 | 2024-01-16 | 中国公路工程咨询集团有限公司 | Neural network-based integrated monitoring system for disaster sky along road |
| CN117409576B (en) * | 2023-09-28 | 2024-04-19 | 中国公路工程咨询集团有限公司 | Neural network-based integrated monitoring system for disaster sky along road |
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Application publication date: 20110330 |